This article analyses the development of EC consumer law by looking in detail at the approach taken by the European Court of Justice in its case law in this field, and the impact that this had had upon national law in certain areas. It contends that the Court has taken contrasting approaches to the desirable extent of consumer protection laws, depending upon whether that protection derives from national laws which operate as derogations from the EC’s Treaty rules on the internal market or from positive legislative activity at EC level. In the former area, the Court has been unwilling to accept many such national consumer protection measures, regularly finding them not to be necessary for achieving the relevant goal or to be disproportionate...